ParkAssist

Electrics and electronics 9

9_65_11

The ultrasonic sensors are powered with a voltage of 12 V. For diagnostic purposes, a piece of foam can be stuck over individual parking sensors. This makes them "blind" and therefore allows isolation of possible sensor faults.

9_66_11

9_67_11

9.8 ParkAssist

The 911 Carrera (991) is equipped as standard with a ParkAssist system with 4 ultrasonic sensors at the rear. This system is also optionally available with Topview display (4 sensors at front and 4 at rear) (see Figs. 9_66_11 and 9_67_11). The ultrasonic sensors in the bumpers are used to calculate the distance between an obstacle and the vehicle bumper. This is then indicated to the driver both audibly and visually. The audible indication signals are different for obstacles at the front/rear. The system performance is designed so that the system does not just permit parking between two vehicles, but also guarantees reliable detection of obstacles with a small reflection area. The basic requirement for the “ParkAssist” system is that it must detect static and dynamic obstacles that could lead to vehicle damage at the front and/or rear. Warnings are provided by visual displays and acoustic warnings via the speaker in the instrument cluster.

The visual warning is provided by a graphic display (Topview display [see Figs. 9_66_11 and 9_67_11]) on the PCM or CDR and is active after "Ignition on".

The operating range is from 0 mph (0km/h) up to a speed of approximately 9 mph (15 km/h). The tones for the audible warning have a lower pitch at the rear than at the front. The intervals decrease to a continuous tone as the vehicle comes closer to an obstacle. The audible warning at the front starts from 39˝ (100 cm) and at the rear from 47˝ (120 cm). A one-off initial warning tone is issued when an obstacle is detected at a distance of 71˝ (180 cm).

If the distance to the obstacle does not change, the tone is faded out after approx. 8 seconds. If the vehicle continues to approach the obstacle, the audible warning starts again. In addition, the distances to obstacles are displayed in the form of a schematic representation of the top view of the vehicle in the central display. The visual warning is activated automatically at a distance of 31˝ (80 cm) at the front and approx. 24˝ (60 cm) at the sides. The visual display is always activated when reverse gear is engaged. ParkAssist is also activated if the rolls back by approx. 12˝ (30 cm) without reverse gear being engaged. Only audible warnings are provided for obstacle distances at the front between 39˝ (100) and 31˝ (80 cm).

The visual warning can be additionally activated by pressing the CAR button on the CD radio (CDR) or Porsche Communication Management (PCM). Obstacles at the side of the vehicle are shown as from approx. 24˝ (60 cm) at the front and from approx. 28˝ (70 cm) at the rear. The distance values determined by the system are filtered to achieve a steady and stable display of obstacles. As a result, obstacles are only displayed after approx. 2 seconds when the vehicle is stationary (as opposed to when it is moving). ParkAssist is activated when the ignition is switched on. ParkAssist can be switched off using the ParkAssist OFF switch in the overhead operating console (LED of the button lights up in this case). ParkAssist remains deactivated until it is switched on again via the button or the ignition is switched off and on again.

ParkAssist is active/in standby mode

• When ignition is switched on • At vehicle speeds <9 mph (15 km/h), vehicle rolling • EPB not actuated • Reverse gear/transmission range "R" selected

ParkAssist is not active

• Ignition off • Vehicle speed > 9 mph (15 km/h) • EPB actuated • Transmission range D • Button in roof console not activated • Function deactivated on CDR 31, PCM 3.1 (visual/audible) Electrics and electronics 9